Jméno
SLR — shift left and roundoff
Popis
Shift fractional contents of AC (except sign digit) and B to the left n places. The positive integer n is treated modulo 32; digits shifted left out of AC1 are lost. (Shifting left n places is equivalent to multiplying by 2n, with the result reduced modulo 1.) Roundoff the result to 15 binary digits and store it in AC. Clear BR. Negative numbers are complemented before the shift and after the roundoff; hence, ones appear in the digit places made vycant by the shift of a negative number. Digit 6 (the 29 = 512 digit of the address) of the instruction slr n must be a zero to distinguish slr n frmo SLH n described below. The instruction slr 0 simply causes roundoff and clears BR. SAM is cleared. Roundof (ρ) may cause overflow with a consequent arithmetic check alarm if |F (AC+BR)2n+ρ| = 1. The execution time varies according to the size of n.
Odkazy
Podobné instrukce:
FIXME:whirlwind.isa.halt;.
